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Concentration of Credit Risk (Tables) | 12 Months Ended
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Dec. 31, 2012
Summary of Funds Provided Ten Percent or More of Total Revenue | The concentration of credit risk with respect to advisory fees receivable is generally limited due to the short payment terms extended to clients by the Company. The following funds provided 10 percent or more of the total revenue of the Company:
|  | Years Ended December 31, |
|  | 2012 |  |  | 2011 |  |  | 2010 |
($ in thousands) |  |  |  |  |  |  |  |  |  |  |  |
Virtus Multi-Sector Short Term Bond Fund |  |  |  |  |  |  |  |  |  |  |  |
Investment management, administration and transfer agent fees |  | $ | 39,475 |  |  | $ | 24,445 |  |  | $ | 14,506 |
Percent of total revenue |  |  | 17 | % |  |  | 14 | % |  |  | 10 | %
Virtus Emerging Markets Opportunities Fund |  |  |  |  |  |  |  |  |  |  |  |
Investment management, administration and transfer agent fees |  | $ | 29,818 |  |  |  | * |  |  |  | * |
Percent of total revenue |  |  | 12 | % |  |  | * |  |  |  | * |
Virtus Premium AlphaSector™ Fund |  |  |  |  |  |  |  |  |  |  |  |
Investment management, administration and transfer agent fees |  | $ | 27,987 |  |  |  | * |  |  |  | * |
Percent of total revenue |  |  | 12 | % |  |  | * |  |  |  | * |
DNP Select Income Fund Inc. |  |  |  |  |  |  |  |  |  |  |  |
Investment management, administration and transfer agent fees |  |  | * |  |  |  | * |  |  | $ | 14,959 |
Percent of total revenue |  |  | * |  |  |  | * |  |  |  | 10 | %
* | Less than 10 percent of total revenue of the Company.

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